Survata is a survey-wall -- meaning you have to answer a survey before you see a given article. They have about 20 publishers signed up, and they're all non-spammy content. Users are all US-based, which can be verified via geo-ip, and there's little reason for people to spoof that here.
I never claimed to have more anecdotal evidence -- the whole point is to try to validate the claims via some form of data collection. It was cheap and fast to do.
Garry's explanation is a good one. The data for this survey was collected via surveywalls (example at [1]), which let visitors access premium content online for free in exchange for answering a few questions.
All respondents here have US IP addresses and self-report age in the 13-25yr range. We generally see honesty rates of 90% or higher to questions for which we can verify the answer (e.g. "Which OS are you currently using?" or "Who is the President of the US?").
I never claimed to have more anecdotal evidence -- the whole point is to try to validate the claims via some form of data collection. It was cheap and fast to do.